package com.chongzi.cloud;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class code6 {
    public List<List<Integer>> threeSum(int[] nums) {
        List<List<Integer>> res = new ArrayList<>();
        Arrays.sort(nums);
        for (int i=0;i<nums.length;i++){
            if (nums[i]>1){
                break;
            }
            if (i>0&&nums[i]==nums[i-1]) {
                continue;
            }
            int left=i+1;
            int right=nums.length-1;
            while (left<right){
                if (nums[i] + nums[left] + nums[right] == 0){
                    List<Integer> item = new ArrayList<>();
                    item.add(nums[i]);
                    item.add(nums[left]);
                    item.add(nums[right]);
                    res.add(item);
                    while(left < right && nums[left] == nums[left + 1]) left++;
                    while(left < right && nums[right] == nums[right - 1])  right--;
                }
                if(nums[i] + nums[left] + nums[right] < 0){

                    left++;
                }else{

                    right--;
                }
            }

        }        return res;

    }
}
